// 项目入口文件
import config from './config/config.js';
import { KafkaConsumer } from './kafka/consumer.js';
import { HeartbeatProcessor } from './processor/heartbeatProcessor.js';
import { DatabaseManager } from './db/databaseManager.js';
import { RedisIntegration } from './redis/redisIntegration.js';

class WebBLSHeartbeatServer {
  constructor() {
    this.config = config;
    this.kafkaConsumer = null;
    this.heartbeatProcessor = null;
    this.databaseManager = null;
    this.redis = null;
    this.consumers = null;
  }

  async start() {
    try {
      // 初始化 Redis（按协议写入心跳与控制台日志）
      this.redis = new RedisIntegration(this.config.redis);
      await this.redis.connect();
      this.redis.startHeartbeat();

      // 初始化数据库连接
      this.databaseManager = new DatabaseManager({ ...this.config.db, maxConnections: 1 });
      await this.databaseManager.connect();
      console.log('数据库连接成功');
      await this.redis?.info('数据库连接成功', { module: 'db' });

      // 打印 Kafka 配置摘要，便于排查连接问题
      console.log('正在初始化 Kafka 消费者...');
      console.log('Kafka 配置:', {
        brokers: this.config.kafka?.brokers,
        topics: this.config.kafka?.topics,
        groupId: this.config.kafka?.groupId,
        fromOffset: this.config.kafka?.fromOffset ?? 'latest',
        ssl: !!this.config.kafka?.sslEnabled,
        sasl: !!this.config.kafka?.saslEnabled ? `enabled (mechanism: ${this.config.kafka?.saslMechanism})` : 'disabled'
      });

      // 初始化处理器（共享批处理队列）
      this.heartbeatProcessor = new HeartbeatProcessor(this.config.processor, this.databaseManager);

      // 在单进程内启动 N 个消费者实例（与分区数匹配）
      const instances = Math.max(1, Number(this.config.kafka?.consumerInstances ?? 1));
      this.consumers = [];
      for (let i = 0; i < instances; i++) {
        const consumer = new KafkaConsumer(
          { ...this.config.kafka, consumerInstanceIndex: i },
          this.heartbeatProcessor.processMessage.bind(this.heartbeatProcessor)
        );
        await consumer.connect();
        await consumer.subscribe();
        await consumer.startConsuming();
        this.consumers.push({ consumer });
      }
      console.log(`Kafka消费者启动成功，共 ${instances} 个实例`);
      await this.redis?.info('Kafka消费者启动成功', { module: 'kafka', topic: this.config.kafka?.topic, instances });

      console.log('BLS心跳接收端启动成功');
      await this.redis?.info('BLS心跳接收端启动成功', { module: 'app' });
    } catch (error) {
      console.error('启动失败:', error);
      await this.redis?.error('启动失败', { module: 'app', error: String(error?.message ?? error) });
      process.exit(1);
    }
  }

  async stop() {
    try {
      if (this.consumers && Array.isArray(this.consumers)) {
        for (const { consumer } of this.consumers) {
          await consumer.stopConsuming();
          await consumer.disconnect();
        }
        this.consumers = null;
      }
      
      if (this.databaseManager) {
        await this.databaseManager.disconnect();
      }

      if (this.redis) {
        await this.redis.info('BLS心跳接收端已停止', { module: 'app' });
        await this.redis.disconnect();
      }
      
      console.log('BLS心跳接收端已停止');
    } catch (error) {
      console.error('停止失败:', error);
    }
  }
}

// 启动服务器
const server = new WebBLSHeartbeatServer();
server.start();

// 处理进程终止信号
process.on('SIGINT', () => {
  server.stop();
  process.exit(0);
});

process.on('SIGTERM', () => {
  server.stop();
  process.exit(0);
});

export { WebBLSHeartbeatServer };